First of all, I know nothing about wiring of guitar and I have some questions about wiring. One day I took my second hand custom 24 to a guitar tech because of the sound of it was muffled when the volume pot turned down. The guitar tech told me that the previous owner changed the volume pot to a wrong pot and that's why it sounds muffled. He also helped me to re-wire all of the wires inside the cavity as he said it is quite messy inside. Recently, I found than if I switch it to bridge pickup and touching the metal parts of the guitar, noises will come out from the amp. I google it and found that it was the grounding issue but I don't know how to fix it as the wire inside is quite complicated to me. I also found that the capacitor was connected to a wrong position on the volume pot according to the PRS official wiring diagram. So my questions is: Would the grounding issue and the wrong welded capacitor affecting the tone of guitar? Here are some pictures of the cavity: Capacitor connected to the wrong pin on the volume pot, it should be welded on the middle pin.